ok you got a point, probably not much to correct on that lense.
But still the listed lense profile is not the new "Art" lense, but the ex dg hsm.
I run the latest trial version to see if it's something for my new canon 5dsr, files are rendered much better then LR.
It will be more of an issue with all the sigma art the 24mm, the 35mm and the 24-35mm.
At least one of them I will plan to buy in near future, they are better then the canon ones, and the 5dsr needs good lenses.
In general I expect to correct distortion, vignetting, CA.
I know this can be corrected manualy, I would really prefer to have a profile, it's a standard.
I come from Hasselblad, and I can tell this company does a really good job on their (own!) lense profiles (in phocus).
I'm sure p1 is doing the same for their MF systems.
Also most Canon lenses are in, so why not put the best lenses the system has to offer?